JavaScript maintain a variable that holds onto nodes even after they have been removed

Recently, I encountered a seemingly simple issue with JavaScript that has me stumped. In my code, I have a variable that stores nodes with a specific class. My goal is to remove these nodes from the DOM while still retaining them in the variable. However, it seems that due to variables storing references, once the nodes are deleted, the variable ends up empty.

Let's take a look at the code snippet:

const modules = document.getElementsByClassName("drag-container");
var parent = document.getElementsByClassName("drag-container")[0].parentElement;
while (parent.firstChild) {
    parent.removeChild(parent.lastChild);
}
// At this point, the modules variable is empty

Is there a way to preserve the content of the modules variable even after the nodes have been removed?

Answer №1

It's important to note that when you use the getElementsByClassName method, it returns a live HTMLCollection. This means that any changes made to the nodes in this collection will also reflect in the original collection. To prevent this, you can clone the collection into an array:

const modules = Array.from(/*insert HTMLCollection here*/);

Answer №2

One way to duplicate the HTMLCollection array (modules) is by utilizing the latest spread syntax.

const copiedModules = [... modules];

Trust this explanation was useful.

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